Prescribing exercise intensity can be achieved using many
physiological variables. One of the most useful manners...
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Prescribing exercise intensity can be achieved using manyphysiological variables. One of the most useful manners may be touse respiratory gas exchange measurements. First describe exerciseintensity zones based upon ventilatoryequivalents. Then relate the following: heart-rate zones,lactate threshold(s), and VO2max to these zones created usingventilatory equivalents.
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First excersice intensity zones based upon ventilatory equivalents During excersice the amount of O2 entering the blood in the lungs is increased because amount of added to each unit of blood and the pulmonary blood flow per minute are increased The P01 of blood flowing into the pulmonary capillaries falls from 40 to 25 mmHg or less so that the alveolar capillary P02 gradient is increased and more O2 enters the blood Blood flow per minute is increased from 55 Lmin to as much as 2035 Lmin The total amount of O2 entering the blood therefore increases from 250mlmin at rest to values as high as 4000mlmin The amount CO2 excertion increases from 200mlmin to as much as 8000mlmin The increase in O2 uptake is proportinate to work load up to a maximum Above this maximum O2 consumption levels off and the blood lactate levels continue to rise The lactate comes from muscles
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